QI (a) A balanced star connected load of (8+ j3) 2 is connected to a 3-phase, 415 V and 50 Hz supply. Draw the circuit diagram, indicating VRN, VRY and all line currents. Calculate: (i) (ii) The 3 line currents (IR, Iy and IB). The total real power (W) and power factor at the 3 phase supply.
Short Transmission Line
A short transmission line is a transmission line that has a length less than 80 kilometers, an operating voltage level of less than 20 kV, and zero capacitance effect.
Power Flow Analysis
Power flow analysis is a topic in power engineering. It is the flow of electric power in a system. The power flow analysis is preliminary used for the various components of Alternating Current (AC) power, such as the voltage, current, real power, reactive power, and voltage angles under given load conditions and is often known as a load flow study or load flow analysis.
Complex Form
A power system is defined as the connection or network of the various components that convert the non-electrical energy into the electric form and supply the electric form of energy from the source to the load. The power system is an important parameter in power engineering and the electrical engineering profession. The powers in the power system are primarily categorized into two types- active power and reactive power.
![Q1 (a) A balanced star connected load of (8 + j3) N is connected to a 3-phase, 415 V
and 50 Hz supply.
Draw the circuit diagram, indicating VRN, VRY and all line currents.
Calculate:
(i)
(ii)
The 3 line currents (IR, Iy and IB).
The total real power (W) and power factor at the 3 phase
supply.
(b)
An unbalanced delta connected load consisting of the phase impedances ZRY
(10+j3) Q, ZYB (12+j0) N and Zbr (8+j3) N is connected to a 3-phase, 440
V, 50 Hz supply. Draw the circuit diagram including the implementation of
a 2 wattmeter power measurement.
Using the information above:
Calculate the 3 load phase currents (IRY, IYB and IBr).
Draw a scaled phasor diagram indicating all phase and line
voltages and the three load phase currents.
Using the scaled phasor diagram or otherwise determine the 3
line currents (IR, Iy and IB).
(i)
(ii)
(ii)
(c)
Determine the total real supply power (W) for Q1(b) based on the 2
wattmeter measurements.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8e8ba70a-b455-4e03-8fde-f9209a556052%2F59136116-1107-484d-a204-9fff64a3aeee%2Frhw4cit_processed.jpeg&w=3840&q=75)
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